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Simplifying (15 + -2x)(20 + -2x) * x = 4x3 + -70x2 Reorder the terms for easier multiplication: x(15 + -2x)(20 + -2x) = 4x3 + -70x2 Multiply (15 + -2x) * (20 + -2x) x(15(20 + -2x) + -2x * (20 + -2x)) = 4x3 + -70x2 x((20 * 15 + -2x * 15) + -2x * (20 + -2x)) = 4x3 + -70x2 x((300 + -30x) + -2x * (20 + -2x)) = 4x3 + -70x2 x(300 + -30x + (20 * -2x + -2x * -2x)) = 4x3 + -70x2 x(300 + -30x + (-40x + 4x2)) = 4x3 + -70x2 Combine like terms: -30x + -40x = -70x x(300 + -70x + 4x2) = 4x3 + -70x2 (300 * x + -70x * x + 4x2 * x) = 4x3 + -70x2 (300x + -70x2 + 4x3) = 4x3 + -70x2 Reorder the terms: 300x + -70x2 + 4x3 = -70x2 + 4x3 Add '70x2' to each side of the equation. 300x + -70x2 + 70x2 + 4x3 = -70x2 + 70x2 + 4x3 Combine like terms: -70x2 + 70x2 = 0 300x + 0 + 4x3 = -70x2 + 70x2 + 4x3 300x + 4x3 = -70x2 + 70x2 + 4x3 Combine like terms: -70x2 + 70x2 = 0 300x + 4x3 = 0 + 4x3 300x + 4x3 = 4x3 Add '-4x3' to each side of the equation. 300x + 4x3 + -4x3 = 4x3 + -4x3 Combine like terms: 4x3 + -4x3 = 0 300x + 0 = 4x3 + -4x3 300x = 4x3 + -4x3 Combine like terms: 4x3 + -4x3 = 0 300x = 0 Solving 300x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '300'. x = 0.00 Simplifying x = 0.00
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